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MSIT 458 Information Security and Assurance

MSIT 458 Information Security and Assurance. VoIP Xeon Group Rohit Bhat Ryan Hannan Alan Mui Irfan Siddiqui. VOIP. What is VoIP ? Business & Security Concerns Security Threats Security Measures Cost/Risk Analysis Legal Consequences. What is VOIP?.

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MSIT 458 Information Security and Assurance

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  1. MSIT 458Information Security and Assurance VoIP Xeon GroupRohit BhatRyan HannanAlan MuiIrfan Siddiqui

  2. VOIP What is VoIP? Business & Security Concerns Security Threats Security Measures Cost/Risk Analysis Legal Consequences

  3. What is VOIP? • Protocol optimized for the transmission of voice through the Internet or other packet switched networks • Also referred to as IP telephony, Internet telephony, voice over broadband, broadband telephony, and broadband phone.

  4. How fast is VoIP growing? • Per a study conducted by IBISWorld: • Industry’s forecast is to experience the largest revenue growth in the telecommunications sector over the next five years, at an annual growth rater of 25%. • Business subscriptions will grow by 44%, compared with consumer subscription growth of 21%. 4

  5. How fast is VoIP growing? • Per a study conducted by IBISWorld: • U.S. will have 25 million paying VoIP customers by 2012. • Total industry revenues in 2008 are forecast at $3.2 billion, reaching $5 billion by 2012. 5

  6. Business Concerns • Integrity – Voice quality should be excellent • Availability – User needs dial-tone 365/24/7 • Confidentiality – All communication should remain confidential • Authenticity – Valid service subscribers should be able to access the service provider’s network • Federal and State regulatory compliance

  7. Security Threats Configuration weaknesses in VoIP devices and underlying operating systems can enable denial of service attacks, eavesdropping, voice alteration (hijacking) and toll fraud (theft of service), all of which can result in the loss of privacy and integrity. Unscrupulous telemarketers could use VoIP (via soft PC based phones) to access customer credit and privacy details. 7

  8. Security Threats Today, the biggest VoIP-related security threats are inside a company's firewall, such as changing a configuration setting to make the CEO's phone ring at a disgruntled employee's desk. Eavesdropping is another potential problem. 8

  9. Security Threats Launch a Denial of Service attack by placing a large number of calls, either as an authorized or unauthorized user, to flood the network. SPIT (spam over Internet telephony or VOIP) – advertising that appears in a VoIP voice mailbox. 9

  10. Security Threats Vishing, the process of persuading users to divulge personal information such as Social Security and credit card numbers. Attackers can "spoof" the caller ID that users see to make the call appear to come from a legitimate organization.

  11. Security Measures Bolster encryption by encoding and decoding information securely, both the conversation and the call numbers. Encrypt VoIP communications at the router or other gateway, not at the individual endpoints. Since some VoIP telephones are not powerful enough to perform encryption, placing this burden at a central point ensures all VoIP traffic emanating from the enterprise network will be encrypted. 11

  12. Security Measures IP Phone must register to make phone calls. • When a phone tries to register, the registrar sends a challenge. • Phone correctly encrypts the challenge, digital certificate from phone manufacturer, and Media Access Control (MAC) address. • Manufacturer certificate cannot be forged because it is burnt into the phone’s non-volatile RAM and cannot be retrieved. 12

  13. Security Measures Separate VoIP network from data network by logically segregating the voice and data networks using vLAN-capable switches. Don't allow interaction between Internet-connected PCs and VoIP components. 13

  14. Security Measures Install an Intrusion Prevention System (IPS) at the network's perimeter to scan for known signatures while blocking or allowing traffic based on application content rather than IP addresses or ports.An IPS can dynamically modify firewall rules or terminate a network session when necessary. 14

  15. Security Measures Session Border Controllers (SBC) prevent someone (most likely a computer program) from generating abnormal number of calls from a legitimate VoIP account within a threshold period.A violation of the threshold policy rule suspends additional call placement from an account for specified period of time.A session key is maintained for the whole of the conversation for security and encryption purposes. 15

  16. Security Measures Implement a voice-aware (VoIP-ready) firewall, which is optimized by voice, allowing the opening of ports only when a connection must be established.Stateful packet inspection can be used to drop attack packets because they are not part of an authenticated connection. 16

  17. Security Measures In order to mitigate the latency issues caused by security measures, add QoS to all devices processing the calls, i.e. turn on this feature on the service provider’s data switch and the data router, as opposed to a phone switch located within the subscriber’s LAN where the call terminates. 17

  18. A look at the VoIP infrastructure 18

  19. Security Threat to Come A lot of the security measures taken today are based on experience with restricting access to data networks. To date, not a single virus is reported that is specific to infecting the VoIP packets. However, it is to come without a doubt. 19

  20. Cost/Risk Analysis Cost/Risk analysis vary from industry to industry and business to business. The best judgment of risk exposure is collective assessment of both immediate and future monetary losses to an organization. Organizations today can utilize research based calculators for estimating the potential cost of a data security breach for any number of 'at risk' records. The same concept can be applied to VoIP. 20

  21. Cost/Risk Analysis A sample identity theft or data breach Cost calculator can be found at www.IdentityTheftAmerica.com/databreachcalculator.asp 21

  22. Legal Consequences Businesses need to be aware that the laws and rulings governing interception or monitoring of VoIP lines, and retention of call records, may differ from those of conventional telephone systems. These issues should be reviewed with legal advisers. Virus attacks delivered through use of VoIP services, such as Skype, may not be held accountable. 22

  23. VoIP Security Questions? 23

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